When and where is PAX?

the gaming competition group gamer thingy. I really want to go, ONLYUSEmeBLADE said that the last PAX was in seattle in like august. I would really like to go, can someone tell me where and when the next one is and where I might be able to keep updated on events like this, cuz they are so much fun. I went to the Halo reach and Halo ODST launch party and had the time of my life.